Comment on

• Young blood reverses age-related impairments in cognitive function and synaptic plasticity in mice.

  Villeda SA, Plambeck KE, Middeldorp J, Castellano JM, Mosher KI, Luo J, Smith LK, Bieri G, Lin K, Berdnik D, Wabl R, Udeochu J, Wheatley EG, Zou B, Simmons DA, Xie XS, Longo FM, Wyss-Coray T. Villeda SA, et al. Nat Med. 2014 Jun;20(6):659-63. doi: 10.1038/nm.3569. Epub 2014 May 4. Nat Med. 2014. PMID: 24793238 Free PMC article.
• Restoring systemic GDF11 levels reverses age-related dysfunction in mouse skeletal muscle.

  Sinha M, Jang YC, Oh J, Khong D, Wu EY, Manohar R, Miller C, Regalado SG, Loffredo FS, Pancoast JR, Hirshman MF, Lebowitz J, Shadrach JL, Cerletti M, Kim MJ, Serwold T, Goodyear LJ, Rosner B, Lee RT, Wagers AJ. Sinha M, et al. Science. 2014 May 9;344(6184):649-52. doi: 10.1126/science.1251152. Epub 2014 May 5. Science. 2014. PMID: 24797481 Free PMC article.
• Vascular and neurogenic rejuvenation of the aging mouse brain by young systemic factors.

  Katsimpardi L, Litterman NK, Schein PA, Miller CM, Loffredo FS, Wojtkiewicz GR, Chen JW, Lee RT, Wagers AJ, Rubin LL. Katsimpardi L, et al. Science. 2014 May 9;344(6184):630-4. doi: 10.1126/science.1251141. Epub 2014 May 5. Science. 2014. PMID: 24797482 Free PMC article.